The correct option is B.
The chromosome is a thread like structures, which is made up of nucleic acid and protein. It is usually found in the nucleus of living organisms and it normally carry genetic information in form of genes.
Answer:
Natural selection.
Explanation:
Imagine in the beginning there was a single species of bird. Naturally, this bird had to expand to the rest of the world, and was distanced as the continents drifted off. But this bird had to cope with various climates and environments. So the bird would gradually mutate over time. The bird in the jungles of central america would develop different colors and a shaped beak, and would better help it survive. This led to being the new normal for birds of this area. It would evolve to cover all the surviving birds in the region, until it is so drastically changed then it is a new species. There are so many different environments, each with its own challenges to overcome, so so many different bird evolve to survive them.
Plants absorb carbon dioxide from the air, combine it with water and light, and make carbohydrates, the process known as photosynthesis.
It is what gives our planet a specific axial tilt, spin and rotation, it is what gives us our present magnetic field.
A force can make an object stop or slow down. Friction is the contact force that slows down or stops an object. Friction is results when two materials rub against each other. When that object is in motion, the friction forces that object to slow down/stop.
